Custom Truck One Source, Inc.
US ˙ NYSE ˙ US23204X1037

SecurityCTOS / Custom Truck One Source, Inc.
InstitutionNorthern Trust Corp
Latest Disclosed Ownership489,076 shares
Latest Disclosed Value $ 3,213,229
Northern Trust Corp reports 3.74% increase in ownership of CTOS / Custom Truck One Source, Inc.

On May 14, 2026 - Northern Trust Corp filed a 13F-HR form disclosing ownership of 489,076 shares of Custom Truck One Source, Inc. (US:CTOS) valued at $3,213,229 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 471,422 shares of Custom Truck One Source, Inc.. This represents a change in shares of 3.74% during the quarter. The current value of the position is $4,890,760 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-14 2026-03-31 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 489,076 17,654 3.74 3,213 18.34 0.0004
2026-02-17 2025-12-31 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 471,422 -45,180 -8.75 2,715 -18.12 0.0003
2025-11-14 2025-09-30 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 516,602 35,436 7.36 3,317 39.56 0.0004
2025-08-13 2025-06-30 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 481,166 34,864 7.81 2,377 26.18 0.0003
2025-05-13 2025-03-31 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 446,302 -6,114 -1.35 1,883 -13.47 0.0003
2025-02-14 2024-12-31 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 452,416 -32,838 -6.77 2,176 29.99 0.0003
2024-11-13 2024-09-30 13F CUSTOM TRUCK ONE SOURCE COM 23204X103 485,254 -21,935 -4.32 1,674 -24.12 0.0003
2024-08-14 2024-06-30 13F CUSTOM TRUCK ONE SOURCE COM 23204X103 507,189 -23,774 -4.48 2,206 -28.61 0.0004
2024-05-14 2024-03-31 13F CUSTOM TRUCK ONE SOURCE COM 23204X103 530,963 -20,007 -3.63 3,090 -9.22 0.0005
2024-02-13 2023-12-31 13F CUSTOM TRUCK ONE SOURCE COM 23204X103 550,970 38,510 7.51 3,405 7.15 0.0006
2023-11-13 2023-09-30 13F CUSTOM TRUCK ONE SOURCE COM 23204X103 512,460 18,884 3.83 3,177 -4.48 0.0006
2023-08-11 2023-06-30 13F CUSTOM TRUCK ONE SOURCE COM 23204X103 493,576 10,658 2.21 3,327 1.43 0.0006
2023-05-15 2023-03-31 13F CUSTOM TRUCK ONE SOURCE COM 23204X103 482,918 -8,352 -1.70 3,279 5.64 0.0007
2023-02-13 2022-12-31 13F CUSTOM TRUCK ONE SOURCE COM 23204X103 491,270 5,864 1.21 3,105 9.68 0.0007
2022-11-14 2022-09-30 13F CUSTOM TRUCK ONE SOURCE COM 23204X103 485,406 9,055 1.90 2,830 6.11 0.0006
2022-08-12 2022-06-30 13F CUSTOM TRUCK ONE SOURCE COM 23204X103 476,351 -11,117 -2.28 2,667 -34.79 0.0006
2022-05-13 2022-03-31 13F CUSTOM TRUCK ONE SOURCE COM 23204X103 487,468 64,212 15.17 4,090 20.79 0.0007
2022-02-08 2021-12-31 13F CUSTOM TRUCK ONE SOURCE COM 23204X103 423,256 7,880 1.90 3,386 -12.62 0.0006
2021-11-15 2021-09-30 13F CUSTOM TRUCK ONE SOURCE COM 23204X103 415,376 239,658 136.39 3,875 131.76 0.0007
2021-08-13 2021-06-30 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 175,718 49,150 38.83 1,672 41.34 0.0003
2021-05-12 2021-03-31 13F NESCO HLDGS COM 64083J104 126,568 -27,110 -17.64 1,183 4.41 0.0002
2021-02-11 2020-12-31 13F NESCO HLDGS COM 64083J104 153,678 -2,759 -1.76 1,133 74.31 0.0002
2020-11-16 2020-09-30 13F NESCO HLDGS COM 64083J104 156,437 -9,571 -5.77 650 -2.55 0.0001
2020-08-14 2020-06-30 13F NESCO HLDGS COM 64083J104 166,008 136,067 454.45 667 580.61 0.0002
2020-05-14 2020-03-31 13F NESCO HLDGS COM 64083J104 29,941 0 0.00 98 -20.33 0.0000
2020-02-14 2019-12-31 13F NESCO HLDGS COM 64083J104 29,941 0 0.00 123 -31.28 0.0000
2019-11-13 2019-09-30 13F NESCO HLDGS COM 64083J104 29,941 29,941 179 0.0000
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.